Have you tried to take the jet out of the housing, put some spa cleaner or jet cleaner directly on them, let sit then take a toothbrush and scrub, move the nozzell around and scrub some more. Keep doing this untill the center part of the jet moves free. This type of jet also has to angle slightly to spin, if it is atrait as it looks in the pic it won't spin right, try pushing it at a slight angle.